CN110687956B - Programmable output power module - Google Patents
Programmable output power module Download PDFInfo
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- CN110687956B CN110687956B CN201910784885.1A CN201910784885A CN110687956B CN 110687956 B CN110687956 B CN 110687956B CN 201910784885 A CN201910784885 A CN 201910784885A CN 110687956 B CN110687956 B CN 110687956B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
- G05F1/571—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overvoltage detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/386—Arrangements for measuring battery or accumulator variables using test-loads
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/461—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using an operational amplifier as final control device
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
- G05F1/573—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
The invention discloses a programmable output power module which comprises a control unit, a main power circuit, a battery power circuit and a direct current power supply, wherein the control unit is respectively connected with the main power circuit, the battery power circuit and the direct current power supply, and the direct current power supply is respectively connected with the main power circuit and the battery power circuit. The direct current power supply is used for providing output energy for the main power supply circuit and the battery power supply circuit. The battery power supply includes a voltage follower as an output and input follower of the battery power supply. According to the method and the device, the digital set value is output, the feedback of the analog output quantity is acquired, the high-precision closed-loop control is realized, the output precision is improved, the cost is reduced, and the size is reduced.
Description
Technical Field
The invention relates to the technical field of battery modules, in particular to a programmable output power module.
Background
At present, common 3C products in the market, such as an intelligent box, a mobile phone, a PAD (PAD application program), an electronic scale and the like, need to be powered and tested, and the charging function of the products needs to be tested due to the existence of a lithium battery. Current industry practice is to use standard battery simulators (instruments) to receive the voltage, current, etc. required by the command output from the PC. However, the battery simulator has the problems of high cost, long delivery period, overlarge volume and inconvenience for equipment miniaturization. How to design a power module with low cost, small volume and convenient carrying is a problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a programmable output power module which provides a main power circuit and a battery power circuit, can be used for providing a programmable power supply and can also be used as a battery simulator, thereby reducing the cost and the volume.
The above object of the present invention is achieved by the following technical solutions:
the utility model provides a power module of programmable output, includes control unit, main power supply circuit, battery power supply circuit, DC power supply is used for converting the DC input voltage of a certain numerical value into the DC output voltage of target numerical value, main power supply circuit is used for providing DC output, battery power supply circuit is used for providing output current or is used for from external input current, control unit is used for output control signal, controls main power supply circuit, battery power supply circuit's operating condition, control unit is connected with main power supply circuit, battery power supply circuit, DC power supply respectively, DC power supply is connected with main power supply circuit, battery power supply circuit respectively.
The invention is further configured to: the main power supply circuit comprises a first current sampling circuit, a first voltage sampling circuit, a first analog-to-digital conversion circuit, a first error amplifying circuit and a first digital-to-analog conversion circuit, the first current sampling circuit is connected with the output end of the direct current power supply, the output ends of the first current sampling circuit and the first voltage sampling circuit are respectively connected with the input end of the first analog-to-digital conversion circuit, the output end of the first analog-to-digital conversion circuit is connected with the input end of the control unit, used for converting the sampling voltage and the sampling current into digital signals and transmitting the digital signals to the control unit, the first error amplifying circuit is connected with the output end of the first digital-to-analog conversion circuit and the output end of the first voltage sampling circuit, the first digital-to-analog conversion circuit is used for converting the reference voltage digital signal output by the control circuit into an analog reference voltage value.
The invention is further configured to: the main power supply circuit further comprises a first overvoltage detection circuit, wherein the input end of the first digital-to-analog conversion circuit is connected with the output end of the control unit and used for converting a first voltage set value output by the control unit into an analog signal, the input end of the first overvoltage detection circuit is connected with the first voltage sampling circuit and the output end of the first digital-to-analog conversion circuit and used for comparing the first sampling voltage with the first voltage set value, and when the first sampling voltage is larger than or equal to the first voltage set value, a voltage interrupt signal is output to the control unit.
The invention is further configured to: the main power supply circuit further comprises a first overcurrent detection circuit, wherein the input end of the first digital-to-analog conversion circuit is connected with the output end of the control unit and used for converting a first current set value output by the control unit into an analog signal, the input end of the first overcurrent detection circuit is connected with the first current sampling circuit and the output end of the first digital-to-analog conversion circuit and used for comparing the first sampling current with the first current set value, and when the first sampling current is larger than or equal to the first current set value, a current interrupt signal is output to the control unit.
The invention is further configured to: the battery power supply circuit comprises a second current sampling circuit, a second voltage sampling circuit, a second analog-to-digital conversion circuit, a second error amplification circuit, a second digital-to-analog conversion circuit, a voltage follower circuit and a summing circuit, wherein a power supply end of the voltage follower circuit is connected with an output end of the direct-current power supply, an input end of the voltage follower circuit is connected with an output end of the second digital-to-analog conversion circuit, an output end of the voltage follower circuit is connected with the second current sampling circuit and is used for outputting a voltage reference value or flowing current when the voltage of the output end is greater than the output voltage; the input end of the second digital-to-analog conversion circuit is connected with the output of the control unit and is used for converting the digital reference value output by the control unit into an analog value; the summing circuit is used for superposing the output voltage reference value output by the second digital-to-analog conversion circuit with a set value to obtain a second voltage reference value and outputting the second voltage reference value to the second error amplifying circuit; the second current sampling circuit is connected with the output end of the voltage follower circuit, the output ends of the second current sampling circuit and the second voltage sampling circuit are respectively connected with the input end of the second analog-to-digital conversion circuit, and the output end of the second analog-to-digital conversion circuit is connected with the input end of the control unit and is used for converting the sampling voltage and the sampling current into digital signals and transmitting the digital signals to the control unit; the second error amplifying circuit outputs a second error control signal to the direct current power supply according to the second voltage reference value and the sampling voltage value, and controls the output of the direct current power supply.
The invention is further configured to: the battery power supply circuit further comprises a second overvoltage detection circuit, wherein the input end of the second digital-to-analog conversion circuit is connected with the output end of the control unit and used for converting a second voltage set value output by the control unit into an analog signal, the input end of the second overvoltage detection circuit is connected with the second voltage sampling circuit and the output end of the second digital-to-analog conversion circuit and used for comparing the second sampling voltage with the second voltage set value, and when the second sampling voltage is larger than or equal to the second voltage set value, a voltage interruption signal is output to the control unit.
The invention is further configured to: the battery power supply circuit further comprises a second overcurrent detection circuit, wherein the input end of the second digital-to-analog conversion circuit is connected with the output end of the control unit and used for converting a second current set value output by the control unit into an analog signal, the input end of the second overcurrent detection circuit is connected with the second current sampling circuit and the output end of the second digital-to-analog conversion circuit and used for comparing the second sampling current with the second current set value, and when the second sampling current is larger than or equal to the second current set value, a current interruption signal is output to the control unit.
The invention is further configured to: the second overcurrent detection circuit comprises a comparison circuit and a positive and negative current reference conversion circuit, wherein the output end of the positive and negative current reference conversion circuit is connected with the input end of the comparison circuit and used for respectively providing different reference current values to be compared with the second sampling current according to different output currents or input currents so as to output a current interrupt signal.
The invention is further configured to: the power supply module also comprises a multi-way switch circuit which is used for respectively transmitting the analog values with different numerical values to the analog-to-digital conversion circuit.
The invention is further configured to: the voltage follower circuit comprises a power operational amplifier circuit, a power end of the power operational amplifier is connected with an output end of a direct current power supply, one input end of the power operational amplifier is connected with one output end of the second digital-to-analog conversion circuit, the other input end of the power operational amplifier is connected with the output end of the second digital-to-analog conversion circuit, output control of the battery power supply is achieved, and meanwhile the power operational amplifier is used as an input load of the battery power supply.
Compared with the prior art, the invention has the beneficial technical effects that:
1. according to the method, the digital set value is output, and then the feedback of the analog output quantity is acquired, so that high-precision closed-loop control is realized, and the output precision is improved;
2. furthermore, the power operational amplifier absorbs input current, and the function of the template battery is achieved;
3. furthermore, the power output function is realized through the voltage follower circuit of the power operational amplifier, so that the function of simulating the battery is completed.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram of a main power circuit according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a battery power circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention discloses a programmable output power module, which comprises a control unit, a main power circuit, a battery power circuit and a direct current power supply, wherein the control unit is respectively connected with the main power circuit, the battery power circuit and the direct current power supply, and the direct current power supply is respectively connected with the main power circuit and the battery power circuit. The direct current power supply is used for providing output energy for the main power supply circuit and the battery power supply circuit.
The direct current power supply is used for converting direct current input voltage with a fixed numerical value into direct current output voltage with a target numerical value, the target numerical value is given by the control circuit, and accurate output is obtained after feedback. The main power circuit is used for providing direct current output, the battery power circuit is used for providing output current or inputting current from the outside to finish the function of simulating the battery, and the control unit is used for outputting a control signal and a set value, controlling the working states of the main power circuit and the battery power circuit and realizing programmable output and input.
In an embodiment of the present application, as shown in fig. 2, the main power circuit includes a current sampling circuit 1, a voltage sampling circuit 1, an analog-to-digital conversion circuit 1, an error amplification circuit 1, and a digital-to-analog conversion circuit 1, where the current sampling circuit 1 is connected to an output end of the dc power supply and is configured to sample an output of the dc power supply, and at this time, the output of the dc power supply is used as an output of the main power supply. The output end of the current sampling circuit 1 and the output end of the voltage sampling circuit 1 are respectively connected with the input end of the analog-to-digital conversion circuit 1, the output end of the analog-to-digital conversion circuit 1 is connected with the input end of the control unit, the sampling voltage and the sampling current are converted into digital signals and transmitted to the control unit, and the control unit uploads the sampling voltage and the sampling current to the upper computer.
The input end of the error amplifying circuit 1 is connected with the output end of the digital-to-analog conversion circuit 1 and the output end of the voltage sampling circuit 1, and is used for comparing a reference voltage value with a sampling voltage, outputting a first error control signal to the direct-current power supply and controlling the output of the direct-current power supply, and the digital-to-analog conversion circuit 1 is used for converting a reference voltage digital signal output by the control circuit into an analog reference voltage value and inputting the analog reference voltage value into the input end of the error amplifying circuit 1.
The main power supply circuit further comprises an overvoltage detection circuit 1, wherein the input end of the digital-to-analog conversion circuit 1 is connected with the output end of the control unit and used for converting a first voltage set value of a digital signal output by the control unit into a first voltage set value of an analog signal, the input end of the overvoltage detection circuit 1 is connected with the voltage sampling circuit 1 and the output end of the digital-to-analog conversion circuit 1 and used for comparing the sampling voltage with the first voltage set value, when the sampling voltage is larger than or equal to the first voltage set value, a voltage interrupt signal is output to the control unit, and the control unit outputs a control signal to control the output of the direct-current power supply.
The main power supply circuit further comprises an overcurrent detection circuit 1, wherein the input end of the digital-to-analog conversion circuit 1 is connected with the output end of the control unit and used for converting a first current set value of a digital signal output by the control unit into a first current set value of an analog signal, the input end of the overcurrent detection circuit 1 is connected with the current sampling circuit 1 and the output end of the digital-to-analog conversion circuit 1 and used for comparing a sampling current with the first current set value, and when the sampling current is larger than or equal to the first current set value, a current interrupt signal is output to the control unit.
In an embodiment of the present application, as shown in fig. 3, the battery power circuit includes a current sampling circuit 2, a voltage sampling circuit 2, an analog-to-digital conversion circuit 2, an error amplifying circuit 2, a digital-to-analog conversion circuit 2, a voltage follower circuit, and a summing circuit, wherein a power end of the voltage follower circuit is connected to an output end of the dc power supply, an input end of the voltage follower circuit is connected to an output end of the digital-to-analog conversion circuit 2, and an output end of the voltage follower circuit is connected to the current sampling circuit 2 for outputting a voltage reference value, at this time, an output end of the voltage follower circuit is an output end of the.
The input end of the digital-to-analog conversion circuit 2 is connected with the output of the control unit and is used for converting the digital reference value output by the control unit into an analog reference value; the summing circuit is used for superposing the output voltage reference value output by the digital-to-analog conversion circuit 2 with a set value to obtain a second voltage reference value and outputting the second voltage reference value to the error amplification circuit 2, namely the reference voltage of the error amplification circuit 2 is greater than the output voltage reference value; the current sampling circuit 2 is connected with the output end of the voltage following circuit, the output ends of the current sampling circuit 2 and the voltage sampling circuit 2 are respectively connected with the input end of the analog-to-digital conversion circuit 2, and the output end of the analog-to-digital conversion circuit 2 is connected with the input end of the control unit and is used for converting the analog quantity of the sampling voltage or the sampling current into a digital signal and transmitting the digital signal to the control unit; the error amplifying circuit 2 outputs a second error control signal to the direct current power supply according to the second voltage reference value and the sampling voltage value, and controls the output of the direct current power supply so that the output of the direct current power supply meets the requirement.
When the voltage applied at the output end of the voltage follower circuit is larger than the output voltage reference value, the voltage follower circuit is used as the load of an external power supply to realize the functional simulation of battery charging,
the battery power supply circuit further comprises an overvoltage detection circuit 2, wherein the input end of the digital-to-analog conversion circuit 2 is connected with the output end of the control unit and used for converting a second voltage set value of a digital signal output by the control unit into a second voltage set value of an analog signal, the input end of the overvoltage detection circuit 2 is connected with the voltage sampling circuit 2 and the output end of the digital-to-analog conversion circuit 2 and used for comparing the sampling voltage of the battery power supply with the second voltage set value, and when the sampling voltage is larger than or equal to the second voltage set value, a voltage interrupt signal is output to the control unit.
The battery power supply circuit further comprises an overcurrent detection circuit 2, wherein the input end of the digital-to-analog conversion circuit 2 is connected with the output end of the control unit and used for converting a second current set value of a digital signal output by the control unit into a second current set value of an analog signal, the input end of the overcurrent detection circuit 2 is connected with the current sampling circuit 2 and the output end of the digital-to-analog conversion circuit 2 and used for comparing the sampling current of the battery power supply with the second current set value, and when the sampling current is larger than or equal to the second current set value, a current interrupt signal is output to the control unit.
In a specific embodiment of the present application, the voltage follower circuit includes a power operational amplifier circuit, a power end of the power operational amplifier is connected to an output end of the dc power supply, one input end of the power operational amplifier is connected to one output end of the digital-to-analog conversion circuit 2, and the other input end thereof is connected to the output end, so as to form the voltage follower circuit, an output of the voltage follower circuit is controlled by the control circuit, so as to realize output control of the battery power supply, and the power operational amplifier is used as an input load of the battery power supply at the same time, so as to realize.
In an embodiment of the present application, the over-current detection circuit 2 includes a comparison circuit, and a positive-negative current reference converting circuit, an output terminal of the positive-negative current reference converting circuit is connected to an input terminal of the comparison circuit, and is configured to provide different reference current values to compare with the second sampling current according to different output currents or input currents, and output a current interrupt signal.
In one embodiment of the present application, the power module further includes a multiplexing switch circuit for respectively transmitting the analog values of different values to the analog-to-digital conversion circuit.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. A programmable output power module, comprising: the control unit is respectively connected with the main power circuit, the battery power circuit and the direct current power supply, and the direct current power supply is respectively connected with the main power circuit and the battery power circuit; the direct current power supply is used for converting direct current input voltage with a certain value into direct current output voltage with a target value, and the target value is given by the control unit; the main power supply circuit is connected with a first output of the direct current power supply and used for providing direct current output; the battery power supply circuit is connected with the second output of the direct-current power supply and is used for providing output current or inputting current from the outside and simulating the output function or the charging function of the battery; the control unit is used for outputting a control signal and a set value, controlling the working states of the main power supply circuit and the battery power supply circuit and realizing programmable output or input; the main power supply circuit is used for sampling the output of the direct-current power supply, the output of the direct-current power supply is used as the output of the main power supply at the moment, a reference voltage digital signal output by the control unit is converted into an analog reference voltage value, the analog reference voltage value is compared with the sampling voltage, a first error control signal is output to the direct-current power supply, and the output of the direct-current power supply is controlled; the battery power supply circuit comprises a voltage follower circuit, wherein a power supply end of the voltage follower circuit is connected with an output end of a direct-current power supply, an input end of the voltage follower circuit is connected with an output end of a digital-to-analog conversion circuit, and an output end of the voltage follower circuit is an output end of the battery power supply and is used for outputting a voltage reference value to realize the analog output function of the battery; the digital-to-analog conversion circuit is used for converting the digital reference value output by the control unit into an analog reference value; when the voltage applied to the output end of the voltage follower circuit is larger than the output voltage reference value, the voltage follower circuit is used as a load of an external power supply, and the functional simulation of battery charging is realized.
2. The programmable output power supply module of claim 1, wherein: the main power supply circuit comprises a first current sampling circuit, a first voltage sampling circuit, a first analog-to-digital conversion circuit, a first error amplifying circuit and a first digital-to-analog conversion circuit, the first current sampling circuit is connected with the output end of the direct current power supply, the output ends of the first current sampling circuit and the first voltage sampling circuit are respectively connected with the input end of the first analog-to-digital conversion circuit, the output end of the first analog-to-digital conversion circuit is connected with the input end of the control unit, used for converting the sampling voltage and the sampling current into digital signals and transmitting the digital signals to the control unit, the first error amplifying circuit is connected with the output end of the first digital-to-analog conversion circuit and the output end of the first voltage sampling circuit, the first digital-to-analog conversion circuit is used for converting the reference voltage digital signal output by the control circuit into an analog reference voltage value.
3. The programmable output power supply module of claim 2, wherein: the main power supply circuit further comprises a first overvoltage detection circuit, wherein the input end of the first digital-to-analog conversion circuit is connected with the output end of the control unit and used for converting a first voltage set value output by the control unit into an analog signal, the input end of the first overvoltage detection circuit is connected with the first voltage sampling circuit and the output end of the first digital-to-analog conversion circuit and used for comparing the first sampling voltage with the first voltage set value, and when the first sampling voltage is larger than or equal to the first voltage set value, a voltage interrupt signal is output to the control unit.
4. The programmable output power supply module of claim 2, wherein: the main power supply circuit further comprises a first overcurrent detection circuit, wherein the input end of the first digital-to-analog conversion circuit is connected with the output end of the control unit and used for converting a first current set value output by the control unit into an analog signal, the input end of the first overcurrent detection circuit is connected with the first current sampling circuit and the output end of the first digital-to-analog conversion circuit and used for comparing the first sampling current with the first current set value, and when the first sampling current is larger than or equal to the first current set value, a current interrupt signal is output to the control unit.
5. The programmable output power supply module of claim 1, wherein: the battery power supply circuit comprises a second current sampling circuit, a second voltage sampling circuit, a second analog-to-digital conversion circuit, a second error amplification circuit, a second digital-to-analog conversion circuit, a voltage follower circuit and a summing circuit, wherein a power supply end of the voltage follower circuit is connected with an output end of the direct-current power supply, an input end of the voltage follower circuit is connected with an output end of the second digital-to-analog conversion circuit, an output end of the voltage follower circuit is connected with the second current sampling circuit and is used for outputting a voltage reference value or flowing current when the voltage of the output end is greater than the output voltage; the input end of the second digital-to-analog conversion circuit is connected with the output of the control unit and is used for converting the digital reference value output by the control unit into an analog value; the summing circuit is used for superposing the output voltage reference value output by the second digital-to-analog conversion circuit with a set value to obtain a second voltage reference value and outputting the second voltage reference value to the second error amplifying circuit; the second current sampling circuit is connected with the output end of the voltage follower circuit, the output ends of the second current sampling circuit and the second voltage sampling circuit are respectively connected with the input end of the second analog-to-digital conversion circuit, and the output end of the second analog-to-digital conversion circuit is connected with the input end of the control unit and is used for converting the sampling voltage and the sampling current into digital signals and transmitting the digital signals to the control unit; the second error amplifying circuit outputs a second error control signal to the direct current power supply according to the second voltage reference value and the sampling voltage value, and controls the output of the direct current power supply.
6. The programmable-output power supply module of claim 5, wherein: the battery power supply circuit further comprises a second overvoltage detection circuit, wherein the input end of the second digital-to-analog conversion circuit is connected with the output end of the control unit and used for converting a second voltage set value output by the control unit into an analog signal, the input end of the second overvoltage detection circuit is connected with the second voltage sampling circuit and the output end of the second digital-to-analog conversion circuit and used for comparing the second sampling voltage with the second voltage set value, and when the second sampling voltage is larger than or equal to the second voltage set value, a voltage interruption signal is output to the control unit.
7. The programmable-output power supply module of claim 5, wherein: the battery power supply circuit further comprises a second overcurrent detection circuit, wherein the input end of the second digital-to-analog conversion circuit is connected with the output end of the control unit and used for converting a second current set value output by the control unit into an analog signal, the input end of the second overcurrent detection circuit is connected with the second current sampling circuit and the output end of the second digital-to-analog conversion circuit and used for comparing the second sampling current with the second current set value, and when the second sampling current is larger than or equal to the second current set value, a current interruption signal is output to the control unit.
8. The programmable output power module of claim 7, wherein: the second overcurrent detection circuit comprises a comparison circuit and a positive and negative current reference conversion circuit, wherein the output end of the positive and negative current reference conversion circuit is connected with the input end of the comparison circuit and used for respectively providing different reference current values to be compared with the second sampling current according to different output currents or input currents so as to output a current interrupt signal.
9. A programmable output power supply module according to claim 2 or 5, characterized in that: the power supply module also comprises a multi-way switch circuit which is used for respectively transmitting the analog values with different numerical values to the analog-to-digital conversion circuit.
10. The programmable-output power supply module of claim 5, wherein: the voltage follower circuit comprises a power operational amplifier circuit, a power end of the power operational amplifier is connected with an output end of a direct current power supply, one input end of the power operational amplifier is connected with one output end of the second digital-to-analog conversion circuit, the other input end of the power operational amplifier is connected with the output end of the second digital-to-analog conversion circuit, output control of the battery power supply is achieved, and meanwhile the power operational amplifier is used as an input load of the battery power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910784885.1A CN110687956B (en) | 2019-08-23 | 2019-08-23 | Programmable output power module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910784885.1A CN110687956B (en) | 2019-08-23 | 2019-08-23 | Programmable output power module |
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